Annotation of src/usr.bin/sed/main.c, Revision 1.38
1.38 ! martijn 1: /* $OpenBSD: main.c,v 1.37 2018/07/11 06:57:18 martijn Exp $ */
1.3 deraadt 2:
1.1 deraadt 3: /*-
4: * Copyright (c) 1992 Diomidis Spinellis.
5: * Copyright (c) 1992, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Diomidis Spinellis of Imperial College, University of London.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.8 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #include <sys/types.h>
1.24 deraadt 37: #include <sys/ioctl.h>
1.19 jasper 38: #include <sys/stat.h>
1.1 deraadt 39:
40: #include <ctype.h>
41: #include <errno.h>
42: #include <fcntl.h>
1.15 millert 43: #include <limits.h>
1.1 deraadt 44: #include <regex.h>
45: #include <stddef.h>
46: #include <stdio.h>
47: #include <stdlib.h>
48: #include <string.h>
49: #include <unistd.h>
1.19 jasper 50: #include <libgen.h>
1.1 deraadt 51:
52: #include "defs.h"
53: #include "extern.h"
54:
55: /*
56: * Linked list of units (strings and files) to be compiled
57: */
58: struct s_compunit {
59: struct s_compunit *next;
60: enum e_cut {CU_FILE, CU_STRING} type;
61: char *s; /* Pointer to string or fname */
62: };
63:
64: /*
65: * Linked list pointer to compilation units and pointer to current
66: * next pointer.
67: */
68: static struct s_compunit *script, **cu_nextp = &script;
69:
70: /*
71: * Linked list of files to be processed
72: */
73: struct s_flist {
74: char *fname;
75: struct s_flist *next;
76: };
77:
78: /*
79: * Linked list pointer to files and pointer to current
80: * next pointer.
81: */
82: static struct s_flist *files, **fl_nextp = &files;
83:
1.19 jasper 84: FILE *infile; /* Current input file */
85: FILE *outfile; /* Current output file */
86:
1.16 djm 87: int Eflag, aflag, eflag, nflag;
1.19 jasper 88: static int rval; /* Exit status */
1.1 deraadt 89:
90: /*
91: * Current file and line number; line numbers restart across compilation
1.19 jasper 92: * units, but span across input files. The latter is optional if editing
93: * in place.
1.1 deraadt 94: */
1.19 jasper 95: const char *fname; /* File name. */
96: const char *outfname; /* Output file name */
97: static char oldfname[PATH_MAX]; /* Old file name (for in-place editing) */
98: static char tmpfname[PATH_MAX]; /* Temporary file name (for in-place editing) */
99: char *inplace; /* Inplace edit file extension */
1.1 deraadt 100: u_long linenum;
101:
1.6 millert 102: static void add_compunit(enum e_cut, char *);
103: static void add_file(char *);
1.21 jasper 104: static int next_files_have_lines(void);
1.1 deraadt 105:
1.24 deraadt 106: int termwidth;
107:
1.35 martijn 108: int pledge_wpath, pledge_rpath;
109:
1.1 deraadt 110: int
1.9 deraadt 111: main(int argc, char *argv[])
1.1 deraadt 112: {
1.24 deraadt 113: struct winsize win;
1.1 deraadt 114: int c, fflag;
1.24 deraadt 115: char *p;
1.1 deraadt 116:
117: fflag = 0;
1.19 jasper 118: inplace = NULL;
119: while ((c = getopt(argc, argv, "Eae:f:i::nru")) != -1)
1.1 deraadt 120: switch (c) {
1.16 djm 121: case 'E':
122: case 'r':
123: Eflag = 1;
124: break;
1.1 deraadt 125: case 'a':
126: aflag = 1;
127: break;
128: case 'e':
129: eflag = 1;
130: add_compunit(CU_STRING, optarg);
131: break;
132: case 'f':
133: fflag = 1;
134: add_compunit(CU_FILE, optarg);
135: break;
1.19 jasper 136: case 'i':
137: inplace = optarg ? optarg : "";
138: break;
1.1 deraadt 139: case 'n':
140: nflag = 1;
141: break;
1.11 ray 142: case 'u':
1.18 millert 143: setvbuf(stdout, NULL, _IOLBF, 0);
1.11 ray 144: break;
1.1 deraadt 145: default:
146: case '?':
147: (void)fprintf(stderr,
1.22 jmc 148: "usage: sed [-aEnru] [-i[extension]] command [file ...]\n"
149: " sed [-aEnru] [-e command] [-f command_file] [-i[extension]] [file ...]\n");
1.1 deraadt 150: exit(1);
151: }
152: argc -= optind;
153: argv += optind;
1.24 deraadt 154:
1.32 bentley 155: termwidth = 0;
156: if ((p = getenv("COLUMNS")) != NULL)
1.24 deraadt 157: termwidth = strtonum(p, 0, INT_MAX, NULL);
1.32 bentley 158: if (termwidth == 0 && ioctl(STDOUT_FILENO, TIOCGWINSZ, &win) == 0 &&
1.24 deraadt 159: win.ws_col > 0)
160: termwidth = win.ws_col;
161: if (termwidth == 0)
1.32 bentley 162: termwidth = 80;
1.37 martijn 163: if (termwidth <= 8)
164: termwidth = 1;
165: else
166: termwidth -= 8;
1.25 deraadt 167:
168: if (inplace != NULL) {
1.33 semarie 169: if (pledge("stdio rpath wpath cpath fattr chown", NULL) == -1)
1.30 jca 170: error(FATAL, "pledge: %s", strerror(errno));
1.25 deraadt 171: } else {
1.27 deraadt 172: if (pledge("stdio rpath wpath cpath", NULL) == -1)
1.30 jca 173: error(FATAL, "pledge: %s", strerror(errno));
1.25 deraadt 174: }
1.1 deraadt 175:
176: /* First usage case; script is the first arg */
177: if (!eflag && !fflag && *argv) {
178: add_compunit(CU_STRING, *argv);
179: argv++;
180: }
181:
182: compile();
183:
184: /* Continue with first and start second usage */
1.35 martijn 185: if (*argv) {
186: if (!pledge_wpath && inplace == NULL) {
187: if (pledge("stdio rpath", NULL) == -1)
188: error(FATAL, "pledge: %s", strerror(errno));
189: }
1.1 deraadt 190: for (; *argv; argv++)
191: add_file(*argv);
1.35 martijn 192: } else {
193: if (!pledge_wpath && !pledge_rpath) {
194: if (pledge("stdio", NULL) == -1)
195: error(FATAL, "pledge: %s", strerror(errno));
196: } else if (pledge_rpath) {
197: if (pledge("stdio rpath", NULL) == -1)
198: error(FATAL, "pledge: %s", strerror(errno));
199: } else if (pledge_wpath) {
200: if (pledge("stdio wpath cpath", NULL) == -1)
201: error(FATAL, "pledge: %s", strerror(errno));
202: }
1.1 deraadt 203: add_file(NULL);
1.35 martijn 204: }
1.1 deraadt 205: process();
206: cfclose(prog, NULL);
207: if (fclose(stdout))
1.29 mmcc 208: error(FATAL, "stdout: %s", strerror(errno));
1.19 jasper 209: exit (rval);
1.1 deraadt 210: }
211:
212: /*
213: * Like fgets, but go through the chain of compilation units chaining them
214: * together. Empty strings and files are ignored.
215: */
216: char *
1.15 millert 217: cu_fgets(char **outbuf, size_t *outsize)
1.1 deraadt 218: {
219: static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
220: static FILE *f; /* Current open file */
221: static char *s; /* Current pointer inside string */
222: static char string_ident[30];
1.13 millert 223: size_t len;
1.1 deraadt 224: char *p;
225:
1.15 millert 226: if (*outbuf == NULL)
227: *outsize = 0;
228:
1.1 deraadt 229: again:
230: switch (state) {
231: case ST_EOF:
232: if (script == NULL)
233: return (NULL);
234: linenum = 0;
235: switch (script->type) {
236: case CU_FILE:
237: if ((f = fopen(script->s, "r")) == NULL)
1.29 mmcc 238: error(FATAL,
1.1 deraadt 239: "%s: %s", script->s, strerror(errno));
240: fname = script->s;
241: state = ST_FILE;
242: goto again;
243: case CU_STRING:
1.36 millert 244: len = snprintf(string_ident, sizeof(string_ident),
245: "\"%s\"", script->s);
246: if (len >= sizeof(string_ident))
1.7 deraadt 247: strlcpy(string_ident +
248: sizeof(string_ident) - 6, " ...\"", 5);
1.1 deraadt 249: fname = string_ident;
250: s = script->s;
251: state = ST_STRING;
252: goto again;
253: }
254: case ST_FILE:
1.13 millert 255: if ((p = fgetln(f, &len)) != NULL) {
1.1 deraadt 256: linenum++;
1.15 millert 257: if (len >= *outsize) {
1.13 millert 258: free(*outbuf);
1.15 millert 259: *outsize = ROUNDLEN(len + 1);
260: *outbuf = xmalloc(*outsize);
1.13 millert 261: }
262: memcpy(*outbuf, p, len);
263: (*outbuf)[len] = '\0';
264: if (linenum == 1 && p[0] == '#' && p[1] == 'n')
1.1 deraadt 265: nflag = 1;
1.13 millert 266: return (*outbuf);
1.1 deraadt 267: }
268: script = script->next;
269: (void)fclose(f);
270: state = ST_EOF;
271: goto again;
272: case ST_STRING:
273: if (linenum == 0 && s[0] == '#' && s[1] == 'n')
274: nflag = 1;
1.13 millert 275: p = *outbuf;
1.15 millert 276: len = *outsize;
1.1 deraadt 277: for (;;) {
1.15 millert 278: if (len <= 1) {
279: *outbuf = xrealloc(*outbuf,
280: *outsize + _POSIX2_LINE_MAX);
281: p = *outbuf + *outsize - len;
282: len += _POSIX2_LINE_MAX;
283: *outsize += _POSIX2_LINE_MAX;
1.1 deraadt 284: }
285: switch (*s) {
286: case '\0':
287: state = ST_EOF;
288: if (s == script->s) {
289: script = script->next;
290: goto again;
291: } else {
292: script = script->next;
293: *p = '\0';
294: linenum++;
1.13 millert 295: return (*outbuf);
1.1 deraadt 296: }
297: case '\n':
298: *p++ = '\n';
299: *p = '\0';
300: s++;
301: linenum++;
1.13 millert 302: return (*outbuf);
1.1 deraadt 303: default:
304: *p++ = *s++;
1.15 millert 305: len--;
1.1 deraadt 306: }
307: }
308: }
1.34 krw 309:
310: return (NULL);
1.1 deraadt 311: }
312:
1.38 ! martijn 313: void
! 314: finish_file(void)
! 315: {
! 316: if (infile != NULL) {
! 317: fclose(infile);
! 318: if (*oldfname != '\0') {
! 319: if (rename(fname, oldfname) != 0) {
! 320: warning("rename()");
! 321: unlink(tmpfname);
! 322: exit(1);
! 323: }
! 324: *oldfname = '\0';
! 325: }
! 326: if (*tmpfname != '\0') {
! 327: if (outfile != NULL && outfile != stdout)
! 328: fclose(outfile);
! 329: outfile = NULL;
! 330: rename(tmpfname, fname);
! 331: *tmpfname = '\0';
! 332: }
! 333: outfname = NULL;
! 334: }
! 335: }
! 336:
1.1 deraadt 337: /*
338: * Like fgets, but go through the list of files chaining them together.
339: * Set len to the length of the line.
340: */
341: int
1.9 deraadt 342: mf_fgets(SPACE *sp, enum e_spflag spflag)
1.1 deraadt 343: {
1.19 jasper 344: struct stat sb;
1.1 deraadt 345: size_t len;
1.2 deraadt 346: char *p;
1.19 jasper 347: int c, fd;
348: static int firstfile;
349:
350: if (infile == NULL) {
351: /* stdin? */
352: if (files->fname == NULL) {
353: if (inplace != NULL)
1.29 mmcc 354: error(FATAL, "-i may not be used with stdin");
1.19 jasper 355: infile = stdin;
356: fname = "stdin";
357: outfile = stdout;
358: outfname = "stdout";
359: }
360:
361: firstfile = 1;
362: }
1.1 deraadt 363:
1.19 jasper 364: for (;;) {
365: if (infile != NULL && (c = getc(infile)) != EOF) {
366: (void)ungetc(c, infile);
367: break;
368: }
369: /* If we are here then either eof or no files are open yet */
370: if (infile == stdin) {
371: sp->len = 0;
372: return (0);
373: }
1.38 ! martijn 374: finish_file();
1.19 jasper 375: if (firstfile == 0)
376: files = files->next;
377: else
378: firstfile = 0;
379: if (files == NULL) {
380: sp->len = 0;
381: return (0);
382: }
383: fname = files->fname;
384: if (inplace != NULL) {
385: if (lstat(fname, &sb) != 0)
1.30 jca 386: error(FATAL, "%s: %s", fname,
1.23 sthen 387: strerror(errno ? errno : EIO));
1.19 jasper 388: if (!S_ISREG(sb.st_mode))
1.29 mmcc 389: error(FATAL, "%s: %s %s", fname,
1.19 jasper 390: "in-place editing only",
391: "works for regular files");
392: if (*inplace != '\0') {
393: strlcpy(oldfname, fname,
394: sizeof(oldfname));
395: len = strlcat(oldfname, inplace,
396: sizeof(oldfname));
397: if (len > sizeof(oldfname))
1.29 mmcc 398: error(FATAL, "%s: name too long", fname);
1.1 deraadt 399: }
1.19 jasper 400: len = snprintf(tmpfname, sizeof(tmpfname), "%s/sedXXXXXXXXXX",
401: dirname(fname));
402: if (len >= sizeof(tmpfname))
1.29 mmcc 403: error(FATAL, "%s: name too long", fname);
1.19 jasper 404: if ((fd = mkstemp(tmpfname)) == -1)
1.31 tb 405: error(FATAL, "%s: %s", fname, strerror(errno));
1.19 jasper 406: if ((outfile = fdopen(fd, "w")) == NULL) {
407: unlink(tmpfname);
1.29 mmcc 408: error(FATAL, "%s", fname);
1.19 jasper 409: }
410: fchown(fileno(outfile), sb.st_uid, sb.st_gid);
411: fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
412: outfname = tmpfname;
413: linenum = 0;
1.38 ! martijn 414: resetstate();
1.19 jasper 415: } else {
416: outfile = stdout;
417: outfname = "stdout";
418: }
419: if ((infile = fopen(fname, "r")) == NULL) {
1.34 krw 420: warning("%s", strerror(errno));
1.19 jasper 421: rval = 1;
422: continue;
1.1 deraadt 423: }
424: }
425:
426: /*
1.19 jasper 427: * We are here only when infile is open and we still have something
428: * to read from it.
429: *
1.1 deraadt 430: * Use fgetln so that we can handle essentially infinite input data.
431: * Can't use the pointer into the stdio buffer as the process space
432: * because the ungetc() can cause it to move.
433: */
1.19 jasper 434: p = fgetln(infile, &len);
435: if (ferror(infile))
1.29 mmcc 436: error(FATAL, "%s: %s", fname, strerror(errno ? errno : EIO));
1.19 jasper 437: if (len != 0 && p[len - 1] == '\n') {
438: sp->append_newline = 1;
439: len--;
440: } else if (!lastline()) {
441: sp->append_newline = 1;
442: } else {
443: sp->append_newline = 0;
444: }
1.1 deraadt 445: cspace(sp, p, len, spflag);
446:
447: linenum++;
1.19 jasper 448:
1.1 deraadt 449: return (1);
450: }
451:
452: /*
453: * Add a compilation unit to the linked list
454: */
455: static void
1.9 deraadt 456: add_compunit(enum e_cut type, char *s)
1.1 deraadt 457: {
458: struct s_compunit *cu;
459:
460: cu = xmalloc(sizeof(struct s_compunit));
461: cu->type = type;
462: cu->s = s;
463: cu->next = NULL;
464: *cu_nextp = cu;
465: cu_nextp = &cu->next;
466: }
467:
468: /*
469: * Add a file to the linked list
470: */
471: static void
1.9 deraadt 472: add_file(char *s)
1.1 deraadt 473: {
474: struct s_flist *fp;
475:
476: fp = xmalloc(sizeof(struct s_flist));
477: fp->next = NULL;
478: *fl_nextp = fp;
479: fp->fname = s;
480: fl_nextp = &fp->next;
1.19 jasper 481: }
482:
483:
484: static int
485: next_files_have_lines()
486: {
1.20 deraadt 487: struct s_flist *file;
488: FILE *file_fd;
489: int ch;
490:
491: file = files;
492: while ((file = file->next) != NULL) {
493: if ((file_fd = fopen(file->fname, "r")) == NULL)
494: continue;
1.19 jasper 495:
1.20 deraadt 496: if ((ch = getc(file_fd)) != EOF) {
497: /*
498: * This next file has content, therefore current
499: * file doesn't contains the last line.
500: */
501: ungetc(ch, file_fd);
502: fclose(file_fd);
503: return (1);
504: }
505: fclose(file_fd);
506: }
507: return (0);
1.19 jasper 508: }
509:
510: int
511: lastline(void)
512: {
513: int ch;
514:
515: if (feof(infile)) {
516: return !(
517: (inplace == NULL) &&
518: next_files_have_lines());
519: }
520: if ((ch = getc(infile)) == EOF) {
521: return !(
522: (inplace == NULL) &&
523: next_files_have_lines());
524: }
525: ungetc(ch, infile);
526: return (0);
1.1 deraadt 527: }
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